EPDM material applications for Grommets and Gaskets

 EPDM, or ethylene-propylene-diene monomer is a type of synthetic rubber that is used in many applications.

When choosing a material to use for rubber grommets or gaskets, many people opt for standard materials such as neoprene or silicone since they are readily available. While these materials may perform as desired for some applications, EPDM offers many favorable features and advantages when compared to other materials, making it an ideal grommet and gasket material.

 

EPDM Grades
EPDM gaskets are manufactured from solid, sponge, or foam rubber materials. Each type of material has a unique molecular structure enabling EPDM gaskets to possess physical properties, such as hardness and chemical resistance, to meet the specifications of many applications. EPDM are categorized by grades such as commercial, peroxide-cured, UL 94 flame-retardant, and FDA-approved.

 

EPDM Grommet and Gasket Material Properties
Ethylene and propylene are both hydrocarbons that remain in gaseous states at room temperature. When combined, they create polymers such as polyethylene and polypropylene, which remain solid. By controlling the polymerization process and adding the proper proportion of ethylene and propylene, it is possible to create EPDM.

The process of manufacturing EPDM creates long molecular chains that give the material its enhanced elastic properties. EPDM is unique among elastomers because it remains flexible at very low temperatures and can be formulated to withstand extremely high temperatures. The material is also resistant to oxidation and the aging effects of ultraviolet light.

EPDM possesses superior mechanical properties. It has a tensile strength ranging from 7 to 21 MPa, making it stronger than silicone, which has a tensile strength of 5 and 10 APa; nitrile, which is between 12 and 15 MPa; and neoprene, which is between 5 and 8 MPa.

EPDM rubber grommets and EPDM rubber gaskets are more resistant to wear from abrasion and are formulated to resist harsh chemicals such as acids and alkalis. EPDM material is ideal for applications involving auto wiring grommets. It’s stability and heat-resistant properties also make it suitable for applications using steam.EPDM rubber grommets/gaskets offer a variety of benefits when compared to other rubber materials. They can withstand harsh environmental conditions and are designed to provide reliable, long-lasting sealing capabilities over a wide range of temperatures from -60° F to 300° F.

EPDM grommets/gaskets offer good electrical insulation and are highly resistant to wear, ultraviolet light, aging, wind, weather, and ozone. They are also color-stable and won’t stain mating surfaces.

 

EPDM Gasket Applications
EPDM is a strong, durable, and cost-effective option that offers superior performance for use in many applications, including:

1)Outdoor. Since EPDM gaskets are able to withstand extreme temperature fluctuations, water, and UV rays, they are ideal for use in outdoor applications.
2)Electrical. The material’s high electrical resistance makes EPDM grommets or EPDM gaskets suitable for many electrical installations.
3)Open Joints. EPDM grommets and EPDM gaskets have a good compression set resistance, which allows for easy recovery, making it appropriate for applications where a joint may open up occasionally.

 

Contact Us About Your EPDM Grommet,Gasket & Seal Needs
At Custom Grommets and Gaskets Manufacturing, we specialize in manufacturing precision molded EPDM rubber parts including grommets and gaskets and seals for various industries and applications. Our commitment to outstanding quality and customer service has earned us a reputation throughout the world as an industry leader. To request a quote or learn more about EPDM grommets and EPDM gaskets, contact us today :sales@rubberbiz.com  or mobile:86-13720889256

 

Rubber bellows production process

 We have over 19 years experience in manufacturing Rubber Bellows /Rubber parts ,and mass production bellows applications. Clients within industries such as Automotive, Aerospace, Marine and Manufacturing choose to work with us to ensure their rubber bellows are provided to the highest of standards. We manufacture rubber bellows using a broad range of rubbers and silicones to meet customer requirements. 

 

Please check the rubber bellows production process as following video:

 

CARB EPA Fuel Line Hose Introduction

 Here I will introduce the fuel line hose producted by our factory.Our CARB/EPA Fuel hose include 2 -layer hose（FKM/ECO）and 4-layer hose（FKM/ECO/Aramid/ECO）.

The following specifications are commonly produced in our factory:
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1)FKM/ECO hose(ID*OD): 4mm*8mm,  5mm*9mm,   6mm*10mm.

 

2)FKM/ECO/Aramid/ECO hose(ID*OD): 6.35mm*12.7mm,     7.94mm*14.3mm,     9.53mm*15.88mm,     12.7mm*19.84mm

We also have other dimensions.If you need, you can also send dimensions and quantity to me and we can customize them.

Our Fuel hose has passed  EPA and CARB certifications.Welcome you to inquire for customization.


Any questions,please feel free to contact us via sales@rubberbiz.com.

Molds for Injection Rubber Molding

 In order to successfully use injection molding, you will need the right rubber mold.

 

Molds are created through two processes: Computer Numerical Control machines (CNC) and Electric Discharge Machines (EDM).

 

CNC machines use cutting tools to cut into a piece of material. If a rubber manufacturer wants to use a plastic mold, it could use a CNC machine to create that mold. When dimensions are inputted into the CNC machine, they cut away the piece of material until it fits the dimensions. Some CNC machines are also equipped with laser printing which is another way for rubber manufacturers to create molds.

 

Electrical Discharge Machines are similar to CNC machines. Instead of cutting, these machines use electric “lasers” to remove parts of the material. When dimensions are entered into the machine, it goes straight to work creating the mold. EDM is typically used for more complicated molds that may require curved edges and specialized shapes.

 

If you are looking for a rubber molding company that provides both standard and custom rubber parts, we can help. Xiamen Fuste Rubber offers molded rubber parts that you need. Here are some of our incredible features:

 

1)Hands-on customer service and engineering team
2)High-quality materials
3)Thousands of prefabricated parts
4)Custom parts in any color, size, function or shape
5)Enhanced durability and safety
6)National and international shipping
7)ISO certified to ensure quality and high standards

 

Let's start cooperation from here ,Please do not hesitate to contact me by sales@rubberbiz.com . 

 

How to Control Plastic Injection Molding Surface Finish

Surface finish on plastic composites can vary a great deal, depending on the physical and chemical properties of the polymer blend as well as the parameters of the injection molding process.
The first objective for a custom injection molder is to determine how important the surface finish is for the appearance and/or performance of the final product. For example, does the product need to be eye-catching or simply functional? Depending on the answer, the material selected and the desired finish will determine the settings for the injection molding process, and any required secondary finishing operations.
SURFACE FINISH CATEGORIES
The Society of Plastics Industry (SPI) standardized surface finishes on injection molding tools. The process used to achieve the finish determines the following grades:
Grade A - Diamond Buffing: Diamond buffing paste has a very fine grain, so finishes are generally very glossy and product surfaces remain flat. Grade A finishes are considered the highest standard.
Grade B - Sandpaper: This semi-gloss finish is applied using sanding grit and is ideal for hiding visible machining marks. The sandpaper grit number provides surface finish control — 600 for the finest finish, 400 for mid-range, and 320 for the most textured finish.
Grade C - Grit Stone: Grit sanding stones generally follow the grit number and finish textures as sandpaper. However, grit stones cut fairly aggressively, which creates a rougher texture compared to B grades.
Grade D - Pressure Blasting: Pressure blasting plastic surfaces with abrasives — typically sand or glass beads — results in non-directional patterns and dull or flat finishes.
Within each grade there are different levels of surface finish, which determines the degree of plastic surface texture. Generally, levels are sequentially numbered within the grades, with 1 being the least amount of texture and higher numbers correlating with more texture. For example, a sandpapered plastic surface finish categorized as a "B1" is semi-gloss and lightly textured; a "B3" is still semi-gloss but has more visual and tactile texture.
Injection molding finishing is an added cost — the higher the grade and finish level, the higher the bottom line. Since it can be a considerable investment, it's important to have an experienced custom injection molder weigh in on the appropriate injection molding surface finish and the most cost-effective tool classification.
AESTHETICS VS. FUNCTIONALITY
There are functional tradeoffs to be considered. For example, the coefficient of friction and resistance to wear can be affected by the surface finish; if these characteristics are important to product performance, the design team needs to select a material and process that will create a compatible finish. Experienced injection molders have a vast body of scientific data on material chemistry, behavior, and processing conditions to cross-reference for accurate determination of surface finish based on process parameters.
It is critical to determine surface finish during the design stage because it will impact the types of material, tooling, and processing decisions that can be considered. The texture on the tool steel will limit the part surface finish. Sometimes a rougher texture can be used to hide other surface imperfections, such as sink. Surface finish can also affect the draft required on the part — without appropriate draft, the surface finish could be destroyed during ejection.
MATERIAL SELECTION CONSIDERATIONS
Two key surface characteristics — gloss and roughness — can be impacted by the material selected, additives, and different injection molding parameters such as fill rate, pressure, and temperature. Material type is especially important — for example, higher melt temperatures for products made from reinforced crystalline resins increase gloss and reduce roughness, creating a smoother surface. If reinforced amorphous resins are being injection-molded, however, a higher mold temperature will increase gloss and reduce roughness.
Another important consideration for surface finish is additive compounds that are mixed into the resin. This is where knowledge of material science really comes into play — for example, fiberglass content results in a lower gloss. Other additives like carbon black or mica can reduce surface roughness — these are additives to avoid (or find substitutes for) if a certain surface roughness must be maintained for product function or appearance. Adding particulate fillers may increase surface roughness. Engineers can mix and match the right combination of resins and additives to produce specific surface qualities.
INJECTION SPEED & TEMPERATURE
Then there’s speed. Faster injection speeds, combined with higher melt or mold temperatures, will further enhance the gloss and smoothness of the surface. In fact, a faster injection speed always improves gloss and smoothness, regardless of the other production parameters that have been determined. For any reinforced composite, the fast injection speed combined with high melt and tool temperatures will always provide the glossiest and smoothest part (although a slow injection speed, combined with cooler tool and melt temperatures, may meet other product specifications, they will typically result in a poor surface texture). Quick filling of the tool cavity can help minimize fiber orientation, making the weld line less visible and boosting the aesthetic quality of the product.

Jingwei molding has more than 15 years experience in plastic injection molding and mold making. Your High Volume, Custom Plastic Injection Molding Specialist.Any questions,please feel free to contact us via info@jweimolding.com or visit us at :jweimolding.com

The effect of precision mold in plastic molding

Plastic products have no alternatives. It can be seen everywhere due to the application of molding. Basically, Molding is the process of manufacturing by shaping liquid or pliable raw material using a rigid frame called a mold or matrix.
Plastic molding is a process where plastic is molded into the desired shape.Plastic mold plays a very vital role in the mold industry. Plastic is a non-metallic compounds produced synthetically. Hence it can be molded into various forms and hardened for various commercial uses. Due to the features like high malleability, cheap in cost & high stability, plastics are of greater use in molding. The process involves putting the material through a hot barrel where it is melted down for mixing. After being melted and mixed, the material is then sent into a mold where it is cooled and solidifies into the same shape as the mold.
Though plastic is a versatile substance but precision molding is needed in order to get the useful shape. Without precision measurement tools, it is almost impossible to build a plastic injection mould. Plastic mold plays a very significant role in the mold industry. In the process of plastic molding, role of precision molds are very much essential. Though plastic is a versatile substance but precision molding is needed in order to get the useful shape.
Without precision measurement tools, it is almost impossible to build a plastic injection mould. The process involves putting the material through a hot barrel where it is melted down for mixing. After being melted and mixed, the material is then sent into a mold where it is cooled and solidifies into the same shape as the mold.

Jingwei is professional plastic mold manufacturer offer quality molding solutions. So contact us on online and get the exact molding solution you want. We can help your business face all of the changes and challenges of today's competitive marketplace.

The Concept of Plastic Injection Molding

Basically Plastic injection molding is the preferred process for manufacturing plastic parts. Plastic has the advantageous features like high malleability, cheap in cost, high stability. So it is being used pervasively in molding. As we know, molding is a process of manufacturing by which liquid or pliable new material get a rigid 

shape called a mold. Plastic molding is a process where plastic is molded into the desired shape.

Injection molding is used to create many things such as electronic housings, containers, bottle caps, automotive interiors, medical parts and most other plastic products available today. Some advantages of injection molding are high tolerance precision, repeatability, large material selection, low labor cost, minimal scrap losses, and little need to finish parts after molding.

The plastic injection mould manufacturer generally require followings in the process of plastic injection molding

1.    an injection molding machine

2.    raw plastic material

3.    A mold.

For manufacturing of plastic injections, There are various types of raw materials such as thermosetting plastic, elastomers and thermoplastic polymers (resins) etc are used for manufacturing of plastic injections as these materials have a greater viscosity. The plastic injection machines have basic component parts such as material hopper, heating unit, plunger etc. The plastic is melted in the injection molding machine and then injected into the mold, where it cools and solidifies into the final part.

Enmould is an experienced plastic injection mould supplier equipped with updated modern technologies. It offers product with ensured quality. So contact us for getting the exact molding solution you want in an affordable price.Our service will turn out to be fitting and cost-effective for you!